This program was created for Mac users who are working with iBooks Author and wish to have access to additional templates for their ongoing projects. The offered samples can be used when designing cookbooks, product brochures, eBooks, and others.
Toolbox for iBooks Author provides you with a limited amount of free templates. The rest of them can be purchased directly from the app's interface (one by one or an entire collection). The price is affordable if you need your work to look more professional.
The program lets you preview the templates before acquiring and installing them on your Mac. Once the download is complete, you can open the templates in the iBooks Author app and start adding your own content to the project.
Unfortunately, the application comes with an important disadvantage: it runs slow and even crashes on some occasions. However, I'm not 100% sure if it's my Mac's or the program's fault for this issue.
In my opinion, you could install the utility on your computer, see how it works, and then decide if you want to keep it or uninstall it from your Mac.